International Journal of Mechanical Sciences最新文献_第10页

Material heterogeneity-driven fracture propagation in concrete 混凝土中材料非均质驱动的断裂扩展

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-01 Epub Date: 2026-01-23 DOI: 10.1016/j.ijmecsci.2026.111300

Mohmad M. Thakur , Butchi S. Pattisapu , Wenfeng Li , Meng Meng , Ryan C. Hurley

Improving the fracture toughness of concrete is key to improving the resilience and longevity of structures throughout our built environment. Microstructural heterogeneity and resulting crack propagation and arrest mechanisms are central to concrete’s fracture toughness. While nanoindentation has shed light on the heterogeneity of moduli and hardness in concrete, more research is needed to understand how individual microstructural phases contribute independently and collectively to macroscopic fracture properties. Here, we combine three-point bend experiments on microbeams of concrete with pre- and post-test X-ray imaging and finite element modeling to investigate the influence of individual phases of concrete on crack propagation mechanisms. We pay careful attention to incorporating realistic fracture properties of the individual phases in modeling based on recent experiments using nanoindentation, microscratch testing, and acoustic emission. Our combined experimental and modeling study reveals that the contrast in the elastic and fracture properties of phases, and microstructural features such as the size and shape of inclusion phases, largely influence the crack propagation mechanisms and effective toughness of the concrete composite. The results provide useful insights into engineering the next generation of tough cementitious materials.

提高混凝土的断裂韧性是提高整个建筑环境中结构的弹性和寿命的关键。微观结构的非均质性和由此产生的裂纹扩展和止裂机制是混凝土断裂韧性的核心。虽然纳米压痕已经揭示了混凝土中模量和硬度的异质性，但需要更多的研究来了解单个微观结构相如何独立和共同地影响宏观断裂特性。在这里，我们将混凝土微梁的三点弯曲实验与测试前后的x射线成像和有限元建模相结合，研究混凝土各个阶段对裂缝扩展机制的影响。基于最近使用纳米压痕、微划痕测试和声发射进行的实验，我们非常注意将各个相的真实断裂特性纳入建模中。实验与模型相结合的研究表明，相的弹性和断裂性能的差异以及夹杂相的尺寸和形状等微观组织特征在很大程度上影响了混凝土复合材料的裂纹扩展机制和有效韧性。该结果为工程下一代坚韧胶凝材料提供了有用的见解。

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引用次数: 0

Damage-rate-dependent model for impact crushing of thin-ply CFRP tubes CFRP薄板管冲击破碎损伤率相关模型

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-01 Epub Date: 2026-01-16 DOI: 10.1016/j.ijmecsci.2026.111268

Alexey Fedorenko , Changfang Zhao , Hao Liu , Boris Fedulov , Evgeny Lomakin , Chen Liu

The dynamic crushing behavior of CFRP tubular specimens with thin-ply laminates is investigated using both experimental studies and finite element modeling. In the proposed constitutive model, rate effects are incorporated using internal damage-rate variables rather than individual strain-rate tensor components. The model is calibrated using impact-test data for CFRP and implemented in Abaqus/Explicit via a VUMAT subroutine. Simulations of tubes with various layups reproduce key experimental observations, including primary failure modes, force–displacement responses, and energy absorption. Accurate prediction of fully developed longitudinal cracks in 0° tubes required extreme mesh refinement, as confirmed by sector analysis of the tube. A detailed analysis of the spatial distribution of damage modes is provided. The proposed approach demonstrates the effectiveness of the rate-dependent modeling framework for predicting the dynamic response of thin-ply composites.

采用实验研究和有限元模拟相结合的方法研究了CFRP薄板管状试件的动态破碎行为。在提出的本构模型中，使用内部损伤率变量而不是单个应变率张量分量来纳入速率效应。该模型使用CFRP的冲击试验数据进行校准，并通过VUMAT子程序在Abaqus/Explicit中实现。不同铺层的管子模拟再现了关键的实验观察结果，包括主要失效模式、力-位移响应和能量吸收。准确预测完全发展的纵向裂纹在0°管需要极端的网格细化，证实了扇形分析管。对损伤模态的空间分布进行了详细的分析。该方法证明了速率相关建模框架预测薄层复合材料动态响应的有效性。

引用次数: 0

Domain-decomposed spectral-ritz framework for 3D elastic dynamics of polyhedral structures 多面体结构三维弹性动力学的域分解谱-里兹框架

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-01 Epub Date: 2026-02-05 DOI: 10.1016/j.ijmecsci.2026.111326

Xiaochao Chen, Chengcheng Chang, Lin Cheng, Runbin Li

In this study, a domain-decomposed spectral-Ritz framework is proposed for the high-fidelity analysis of three-dimensional elastic structures with polyhedral geometries and generalized boundary conditions. The global domain is partitioned into a small number of non-overlapping polyhedral subdomains, each independently mapped to a standard unit cube through trilinear transformation. Within each subdomain, displacement fields are approximated using global Jacobi polynomial-based spectral expansions, and the governing equations are derived from three-dimensional elasticity via the Ritz variational principle. The key contribution of this work is the systematic extension of the spectral–Ritz method to a domain-decomposed three-dimensional elastic framework applicable to complex polyhedral geometries. Unlike existing spectral formulations that are largely restricted to single, regular domains or lower-dimensional structural models, the proposed approach enables multiple heterogeneous subdomains—each with independent geometric mappings and spectral approximations—to be consistently assembled within a unified variational setting. Generalized boundary and interfacial constraints are incorporated at the energy level through weak enforcement strategies, allowing the resulting formulation to retain spectral accuracy while achieving geometric and topological flexibility. The effectiveness of presented method is demonstrated through free vibration, forced response, and transient dynamic analyses, complemented by finite element and experimental modal validation. The results confirm that the proposed framework achieves high accuracy with significantly reduced degrees of freedom, making it well suited for complex three-dimensional structural dynamics problems.

本文提出了一种适用于具有多面体几何形状和广义边界条件的三维弹性结构高保真分析的域分解谱-里兹框架。将全局域划分为少量不重叠的多面体子域，每个子域通过三线性变换独立映射到一个标准的单位立方体。在每个子域中，利用基于全局Jacobi多项式的谱展开近似求解位移场，并利用Ritz变分原理从三维弹性中推导出控制方程。这项工作的关键贡献是将谱-里兹方法系统地扩展到适用于复杂多面体几何的域分解三维弹性框架。与现有的主要局限于单一规则域或低维结构模型的光谱公式不同，该方法使多个异构子域（每个子域具有独立的几何映射和光谱近似）能够在统一的变分设置中一致地组装。通过弱执行策略，将广义边界和界面约束纳入能量级别，从而使所得公式在保持光谱精度的同时实现几何和拓扑灵活性。通过自由振动、强迫响应和瞬态动力分析，并辅以有限元和实验模态验证，证明了该方法的有效性。结果表明，所提出的框架在显著降低自由度的情况下获得了较高的精度，使其非常适合复杂的三维结构动力学问题。

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引用次数: 0

Interfacial shear behavior between high-performance geopolymer concrete and normal concrete 高性能地聚合物混凝土与普通混凝土界面剪切性能研究

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-01 Epub Date: 2026-01-20 DOI: 10.1016/j.ijmecsci.2026.111277

Zhen Gao , Peng Zhang , Xinjian Sun , Jinjun Guo

Geopolymer concrete are increasingly employed in concrete repair systems due to its excellent bonding behavior with existing concrete structures. In this study, high-performance geopolymer concrete (HPGC) was prepared using steel and Polyvinyl alcohol (PVA) fibers, and the shear bond behavior at the interface between normal concrete (NC) and HPGC was investigated through direct shear tests. The hybrid effect on the flexural bond performance at the HPGC-NC interface was quantitatively evaluated, and the microstructure of the HPGC-NC interface was analyzed using the backscattered electron (BSE) test method. A damage mechanics model for HPGC was developed, incorporating mesoscale structural features such as fibers, matrix, and interfaces. And a constitutive model was constructed to characterize the interfacial bond-slip behavior between HPGC and NC. The test results showed that the shear strengths between HPGC and NC were 2.22 MPa - 3.47 MPa, and the corresponding peak slip values were 0.317 mm-0.642 mm. In addition, the bond performance of the HPGC-NC interface was also affected by the surface treatment mode. The simulated results were highly consistent with the testing failure mode and mechanical response. And it demonstrated that the cohesive zone model considering interface damage can precisely capture the failure process of the HPGC-NC interface. The research findings can provide a theoretical basis for the application of geopolymer concrete in the repair of concrete structures.

地聚合物混凝土由于其与现有混凝土结构的良好粘合性能，越来越多地应用于混凝土修复系统。采用钢纤维和聚乙烯醇（PVA）纤维制备高性能地聚合物混凝土（HPGC），通过直剪试验研究了普通混凝土（NC）与高性能地聚合物混凝土（HPGC）界面的剪切粘结行为。定量评价了杂化效应对hplc - nc界面弯曲键合性能的影响，并利用背散射电子（BSE）测试方法分析了hplc - nc界面的微观结构。建立了包含纤维、基体和界面等细观结构特征的HPGC损伤力学模型。建立了表征HPGC与NC界面黏结滑移行为的本构模型。试验结果表明，HPGC与NC的抗剪强度为2.22 MPa ~ 3.47 MPa，相应的峰值滑移值为0.317 mm ~ 0.642 mm。此外，表面处理方式对hplc - nc界面的结合性能也有影响。模拟结果与试验破坏模式和力学响应高度一致。结果表明，考虑界面损伤的内聚区模型能较准确地反映界面破坏过程。研究结果可为地聚合物混凝土在混凝土结构修复中的应用提供理论依据。

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引用次数: 0

Spool-integrated hydrostatic bearing performance analyses for two-dimensional hydraulic valves 二维液压阀阀芯集成静压轴承性能分析

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-01 Epub Date: 2026-02-03 DOI: 10.1016/j.ijmecsci.2026.111347

Chuan Ding , Hanyu Xu , Penghui Gao , Shuo Liu , Yu Huang , Jian Ruan

This study proposes an innovative spool-integrated hydrostatic bearing design for two-dimensional hydraulic valves. The proposed design can actively offset radial unbalanced forces under extreme operating conditions, such as high pressure and high-G, while reducing spool sticking and improving valve response performance and service life. In addition, to clarify the performance of the hydrostatic bearing under operating conditions, a numerical simulation model is constructed to analyze the influence of eccentricity and inlet pressure on bearing performance and reveal the coupling relationship between outflow and radial support force. The actual bearing performance and reliability of the numerical simulation model are verified through bearing performance tests. The results indicate that the manufacturing tolerance of the fit clearance is the primary cause of discrepancies between the experimental and numerical simulation results. The results also demonstrate the high sensitivity of bearing performance to variations in fit clearance. This study provides theoretical guidance for designing hydrostatic bearings for two-dimensional hydraulic valves and offers an innovative potential solution for the problem of spool sticking in hydraulic spool valves.

提出了一种新颖的二维液压阀阀芯集成静压轴承设计方案。所提出的设计可以主动抵消极端工作条件下的径向不平衡力，如高压和高g，同时减少阀芯粘滞，提高阀门响应性能和使用寿命。此外，为了明确静液轴承在工作条件下的性能，建立了数值模拟模型，分析了偏心距和进口压力对轴承性能的影响，揭示了流出量与径向支撑力之间的耦合关系。通过轴承性能试验，验证了数值模拟模型的实际轴承性能和可靠性。结果表明，配合间隙的制造公差是导致实验结果与数值模拟结果不一致的主要原因。结果还表明，轴承性能对配合间隙的变化高度敏感。该研究为二维液压阀静压轴承的设计提供了理论指导，并为解决滑阀阀芯卡死问题提供了创新的解决方案。

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引用次数: 0

Bidirectional vibration control for FOWTs using tuned cable-inerter systems 基于调谐电缆-干涉系统的fowt双向振动控制

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-01 Epub Date: 2026-01-17 DOI: 10.1016/j.ijmecsci.2026.111275

Mingmiao Chen , Shujin Li , Ruibo Wang , Yunting Sun , Yuan Zhao

When mitigating vibrations in the superstructure of floating offshore wind turbines (FOWTs), installing liquid dampers, tuned mass dampers (TMDs), and their derivatives in the nacelle introduces substantial additional mass to the superstructure. This issue is particularly critical for FOWTs that rely on a low center of gravity for stability, as such installations may compromise overall platform stability. To address this challenge and suppress bidirectional vibrations of FOWTs, this study proposes installing tuned cable-inerter systems (TCIS) along the fore-aft and side-side directions of the tower to reduce bidirectional vibrations of the superstructure, thereby avoiding additional mass in the nacelle. Focusing on a semi-submersible FOWT, an aero-hydro-servo-elastic simulation model integrated with TCIS is developed, and its accuracy is validated against simulations from the wind turbine simulation tool OpenFAST. Given that closed-form tuning methods cannot adequately account for the complex coupling characteristics of FOWTs and the stochastic nature of external environmental loads, a two-stage optimization framework for TCIS is developed: fixed-point theory is used to efficiently determine initial optimized parameters, followed by refined optimization using the grey wolf optimizer based on time-domain nonlinear simulations of the fully coupled model. This approach enhances TCIS performance while requiring a lower damping ratio. The optimized TCIS is then compared with an optimized TMD. Results demonstrate that the performance of TCIS in suppressing fore-aft and side-side vibrations of the FOWT superstructure is significantly superior to that of the TMD. Unlike the TMD, which amplifies low-frequency responses of the FOWT, TCIS not only exhibits broader-band suppression capability for high-frequency vibrations of the superstructure but also reduces low-frequency responses to some extent.

在浮式海上风力涡轮机（FOWTs）上部结构中，安装液体阻尼器、调谐质量阻尼器（TMDs）及其衍生物会给上部结构带来大量额外的质量。对于依赖低重心稳定的fowt来说，这个问题尤其重要，因为这样的安装可能会损害整个平台的稳定性。为了解决这一问题并抑制fowt的双向振动，本研究建议沿塔架的前后和左右方向安装调谐电缆干涉系统（TCIS），以减少上部结构的双向振动，从而避免在机舱内增加质量。以半潜式风力机为研究对象，建立了集成TCIS的气动-液压-伺服-弹性仿真模型，并通过风力机仿真工具OpenFAST的仿真验证了模型的准确性。考虑到闭式调谐方法不能充分考虑FOWTs的复杂耦合特性和外部环境载荷的随机性，提出了TCIS的两阶段优化框架：利用不动点理论有效确定初始优化参数，然后基于全耦合模型的时域非线性仿真，利用灰狼优化器进行精细化优化。这种方法提高了TCIS的性能，同时需要更低的阻尼比。然后将优化后的TCIS与优化后的TMD进行比较。结果表明，TCIS对舰载机上部结构前后和侧侧振动的抑制效果明显优于TMD。与TMD放大FOWT的低频响应不同，TCIS不仅对上层结构的高频振动表现出更宽的抑制能力，而且在一定程度上降低了低频响应。

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引用次数: 0

Dynamic modeling and model order-reduction of on-orbit assembled multi-plate structures 在轨装配多板结构动力学建模及模型降阶

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-01 Epub Date: 2026-01-20 DOI: 10.1016/j.ijmecsci.2026.111296

Kairui Min, Wei Fan, Hui Ren, Ping Zhou, Yu Wang, Xiaodong Zhang

On-orbit assembly is a pivotal enabling technology for advancing spacecraft modularity and autonomy. However, the accurate modeling and efficient simulation of on-orbit assembled structures face significant challenges, due to their evolving configurations, large degrees of freedom, and high interconnection complexity. This work proposes an efficient model order-reduction (MOR) method to enable fast and accurate simulation for space on-orbit assembled multi-plate structures. The dynamic model is developed using a reference nodal coordinate formulation, which captures the high-fidelity dynamics, albeit resulting in a high-dimensional system. A nonlinear modal reduction approach is further applied to generate a compact reduced-order model, incorporating global vibration modes and modal derivatives to preserve good accuracy. The key issue in MOR – optimal mode selection – is resolved through a novel kinetic-energy-based modal interaction method, which identifies dominant modes without prior full-order simulations, making it particularly suited for varying topologies. The proposed method is validated with octagonal and rectangular assemblies. Numerical results demonstrate that the method exhibits high accuracy, strong adaptability, and excellent efficiency. Notably, the computational cost is decreased for nearly 99%. The proposed method offers a promising technique for the dynamic analysis and control in space missions.

在轨装配是推进航天器模块化和自主性的关键使能技术。然而，由于在轨装配结构构型不断变化、自由度大、互连复杂性高等特点，其准确建模和高效仿真面临着巨大挑战。本文提出了一种有效的模型降阶方法，以实现空间在轨装配多板结构的快速准确仿真。采用参考节点坐标公式建立了动态模型，该模型捕获了高保真动态，尽管导致了高维系统。进一步采用非线性模态约化方法生成紧凑的降阶模型，该模型结合了全局振动模态和模态导数以保持良好的精度。通过一种新的基于动能的模态相互作用方法解决了MOR的关键问题-最优模态选择，该方法无需事先进行全阶模拟即可识别优势模态，使其特别适合于不同的拓扑结构。用八角形和矩形装配体对该方法进行了验证。数值结果表明，该方法具有精度高、适应性强、效率高等特点。值得注意的是，计算成本降低了近99%。该方法为空间任务的动态分析与控制提供了一种很有前途的技术。

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引用次数: 0

Dual-stage energy-absorbing corrugated-reinforced re-entrant honeycomb with enhanced stiffness 具有增强刚度的双级吸能波纹增强再入蜂窝

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-01 Epub Date: 2026-01-29 DOI: 10.1016/j.ijmecsci.2026.111319

Wang Jian , Zhong Yifeng , Tang Yuxin , Poh Leong Hien

This study presents a novel bio-inspired corrugated-reinforced re-entrant honeycomb (CRH) with a unique externally attached reinforcement topology, designed to overcome the stiffness and energy absorption limitations of conventional auxetic honeycombs. Unlike previous internally reinforced or nested designs, the CRH incorporates independent wavy reinforcements along its outer boundary, leading to a previously unreported dual-stage plateau behavior under compression. Quasi-static compression tests and finite element simulations reveal that this behavior is initiated by contact between the corrugated reinforcements and inner inclined struts, followed by interaction with the horizontal ligaments. Compared to traditional re-entrant honeycombs, the CRH demonstrates approximately 10-fold higher initial stiffness, 3-fold greater plateau stress, and 2.375-fold improvement in specific energy absorption. To enable efficient large-scale analysis, a novel 3D equivalent Cauchy model (3D-ECM) is developed and validated for rapid prediction of effective elastic properties. Theoretical models based on unit cell collapse mechanisms accurately predict the dual-plateau stresses. Parametric studies identify an optimal design with a re-entrant angle of 65°, strut spacing ratio of 1.5, and strut thickness ratio of 1.0, offering superior stiffness, energy absorption, and preserved auxeticity. The CRH represents a significant advance in auxetic metamaterial design, providing a lightweight and highly efficient energy-absorbing structure for impact-resistant applications.

本研究提出了一种新颖的仿生波纹增强再入式蜂窝（CRH），具有独特的外部附加增强拓扑结构，旨在克服传统增减蜂窝的刚度和能量吸收限制。与之前的内部加固或嵌套设计不同，CRH在其外边界处采用了独立的波状加固，导致了以前未报道的压缩下的双阶段平台行为。准静态压缩试验和有限元模拟结果表明，波纹增强筋首先与内部倾斜支撑接触，然后与水平韧带相互作用。与传统的重入式蜂窝相比，CRH的初始刚度提高了约10倍，平台应力提高了3倍，比能吸收提高了2.375倍。为了实现高效的大规模分析，开发并验证了一种新的三维等效柯西模型（3D- ecm），用于快速预测有效弹性特性。基于单元胞崩溃机制的理论模型可以准确预测双平台应力。参数化研究确定了最优设计方案：可重入角为65°，支撑间距比为1.5，支撑厚度比为1.0，具有优越的刚度、能量吸收和保留的刚度。CRH代表了消声超材料设计的重大进步，为抗冲击应用提供了轻质、高效的吸能结构。

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引用次数: 0

An improved point-to-surface contact algorithm with penalty method for peridynamics 一种改进的环动力学点面接触罚法算法

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-01 Epub Date: 2026-01-16 DOI: 10.1016/j.ijmecsci.2026.111276

Haoran Zhang , Jun Li , Hai Mei , Xin Lai , Lisheng Liu

In Peridynamics (PD), it is challenging to identify surface particles and determine contact forces accurately for complex contact and collision problems. In the present study, we propose an improved point-to-surface contact algorithm with penalty function method for PD simulations. This contact algorithm enables the automatic identification of surface particles, which thus provides a straightforward and accurate estimation of contact forces. The algorithm first employs the eigenvalue method to detect external surface particles, followed by a global search using Verlet list to identify all potential contact particle pairs. Subsequently, a local point-to-surface search is then performed to determine exact contact locations, after which the contact forces are calculated via the penalty method. The accuracy and versatility of the algorithm are demonstrated through typical contact examples, including interactions between an elastic body and a rigid plane as well as between two elastic bodies, and high-velocity dynamic impacts, specifically penetration of a ceramic plate by a metallic projectile in frontal and edge-impact configurations. The simulations reproduce experimentally observed fracture characteristics, including central fragmentation, radial cracking, and circumferential fracture rings, as well as projectile damage and plastic deformation. Compared to other PD contact models, the calculated contact force exhibits better agreement with Hertz contact theory. This work provides a robust and accurate contact modeling framework for PD simulations, offering a reliable tool for investigating complex multi-body interactions, impact damage, and collision phenomena in practical engineering applications.

在周围动力学（PD）中，对于复杂的接触和碰撞问题，如何准确地识别表面颗粒并确定接触力是一个挑战。在本研究中，我们提出了一种改进的基于罚函数法的点面接触算法。这种接触算法能够自动识别表面颗粒，从而提供了直接而准确的接触力估计。该算法首先采用特征值法检测外表面粒子，然后采用Verlet列表进行全局搜索，识别所有潜在的接触粒子对。然后，进行局部点-面搜索以确定准确的接触位置，然后通过惩罚法计算接触力。通过典型的接触实例，包括弹性体与刚性平面之间的相互作用以及两个弹性体之间的相互作用，以及高速动态碰撞，特别是金属弹丸在正面和边缘碰撞配置中穿透陶瓷板，证明了该算法的准确性和通用性。模拟重现了实验观察到的断裂特征，包括中心破碎、径向开裂和环向断裂环，以及弹丸损伤和塑性变形。与其他局部放电接触模型相比，计算得到的接触力与Hertz接触理论更吻合。这项工作为PD模拟提供了一个强大而准确的接触建模框架，为研究实际工程应用中复杂的多体相互作用、冲击损伤和碰撞现象提供了可靠的工具。

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引用次数: 0

Additive manufacturing of vibration attenuation and load-bearing integrated metamaterials 减振和承重集成超材料的增材制造

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-03-01 Epub Date: 2026-01-19 DOI: 10.1016/j.ijmecsci.2026.111292

Yaqi Tian , Cong Zhang , Lei Yang

To resolve the inherent contradiction between low-frequency vibration attenuation and load-bearing performance in conventional metamaterials, this study proposes an innovative hybrid metamaterial design methodology. This method employs a Primitive-type triply periodic minimal surface (TPMS) structure fabricated via laser powder bed fusion (LPBF) as the load-bearing skeletal framework, within which local resonant units are embedded to achieve vibration attenuation. The bending wave bandgap, governed by local resonance mechanisms, yields significant vibration attenuation in the low-frequency domain, achieving a maximum transmission loss of 71.6 dB. Benefiting from its narrow-neck and wide-cavity topological configuration, the Primitive-type TPMS skeletal structure achieves synergistic optimization of both mechanical and vibration attenuation performance. In terms of load-bearing, its continuous and smooth curved surfaces enable uniform stress distribution and a stable compressive plateau stress. Regarding vibration attenuation, compared with the traditional box skeletal structure, the Primitive skeletal structure employed in this study can significantly broaden the bandwidth of the bandgap while maintaining the same parameters of the resonator. The key innovation lies in actively regulating the topological configuration of the skeletal structure, which enhances the effective mass ratio between the resonator and the matrix, thereby achieving a substantial broadening of the bandgap. Based on the designed metamaterial sandwich plate, a metamaterial floating raft is constructed and applied to the propulsion shaft-floating raft-hull coupled system of underwater vehicles. This metamaterial floating raft ensures structural bending rigidity while effectively mitigating the vibro-acoustic response of the hull surface, thereby enhancing the acoustic stealth performance of the vehicle. This research offers a new framework for designing metamaterial structures that combine load-bearing and vibration attenuation.

为解决传统超材料低频振动衰减与承载性能之间的内在矛盾，本研究提出了一种创新的混合超材料设计方法。该方法采用激光粉末床融合（LPBF）制备的原始型三周期最小表面（TPMS）结构作为承载骨架框架，在其内部嵌入局部谐振单元以实现振动衰减。弯曲波带隙受局部共振机制控制，在低频域产生显著的振动衰减，最大传输损耗为71.6 dB。得益于其窄颈宽腔的拓扑结构，原始型TPMS骨架结构实现了力学性能和减振性能的协同优化。在承载方面，其连续光滑的曲面使应力分布均匀，具有稳定的平台压应力。在减振方面，与传统的箱形骨架结构相比，本研究采用的原始骨架结构在保持谐振器参数不变的情况下，能显著拓宽带隙的带宽。关键创新在于主动调节骨架结构的拓扑构型，提高了谐振腔与基体的有效质量比，从而实现了带隙的大幅拓宽。基于所设计的超材料夹层板，构造了超材料浮筏，并将其应用于水下航行器推进轴-浮筏-船体耦合系统。这种超材料浮筏保证了结构的抗弯刚度，同时有效地减轻了船体表面的声振响应，从而提高了车辆的声隐身性能。该研究为设计承载与减振相结合的超材料结构提供了新的框架。

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引用次数: 0